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Analogue Nagravision (Syster) encoder
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<blockquote data-quote="Captain Jack" data-source="post: 1081694" data-attributes="member: 243342"><p>OK, so one thing that's clear is that the 'new' French C+ card doesn't work with audience 11 from the old key. They have different ATRs and therefore different VBI lines. This suggests to me that C+ at one point or another did a card change and ran encryption on both - sort of like simulcrypt.</p><p></p><p>The quick lock/unlock means the decoder found VBI data but key responded with 0A - so it stopped descrambling.</p><p></p><p>Same as Canal+ Poland. Can you try it with cplfa?</p><p></p><p>Many thanks for the translation. Most of it I already knew through disassembling the PIC code.</p><p></p><p>Interestingly, they used audience 11 key used in C+ France card to get this value. </p><p></p><p></p><p>That makes sense. The two halves of the answer depend on each other and there's some masking going on. Only 60 bits are actually used to seed the decoder.</p><p></p><p>The DES function is already in my fork - that's how I can generate random CWs. I will look through the code and see if there's anything I missed.</p><p></p><p>One thing that is a mystery still is how does the key validate whether the 2x 8-bytes halves are valid. There doesn't seem to be a hash in use so it's likely to be some date, theme and operator bytes that are somehow masked with other values. </p><p></p><p>I need to read that Spanish doc and see if it gives any clues. It seems to have good info on what audience levels correspond to what keys within the card.</p></blockquote><p></p>
[QUOTE="Captain Jack, post: 1081694, member: 243342"] OK, so one thing that's clear is that the 'new' French C+ card doesn't work with audience 11 from the old key. They have different ATRs and therefore different VBI lines. This suggests to me that C+ at one point or another did a card change and ran encryption on both - sort of like simulcrypt. The quick lock/unlock means the decoder found VBI data but key responded with 0A - so it stopped descrambling. Same as Canal+ Poland. Can you try it with cplfa? Many thanks for the translation. Most of it I already knew through disassembling the PIC code. Interestingly, they used audience 11 key used in C+ France card to get this value. That makes sense. The two halves of the answer depend on each other and there's some masking going on. Only 60 bits are actually used to seed the decoder. The DES function is already in my fork - that's how I can generate random CWs. I will look through the code and see if there's anything I missed. One thing that is a mystery still is how does the key validate whether the 2x 8-bytes halves are valid. There doesn't seem to be a hash in use so it's likely to be some date, theme and operator bytes that are somehow masked with other values. I need to read that Spanish doc and see if it gives any clues. It seems to have good info on what audience levels correspond to what keys within the card. [/QUOTE]
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